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life cycles laboratory

Life Cycles Laboratory

Observations of Life Cycle Stages in Protists and Plants

haplontic life cycle of chlamydomonas
Haplontic Life Cycle of Chlamydomonas

Resting spore withstands poor conditions

  • Photosynthetic protist showing an early eukaryotic life cycle
  • No mitosis in diploid phase

To observe: Place a drop from the cell culture between a slide and cover slip.

haplontic life cycle of ulothrix
Isogametes fuse to form diploid zygote

Gametangium: cell that produces gametes by mitosis

Haplontic Life Cycle of Ulothrix
  • Photosynthetic Protist
  • No mitosis in diploid phase
  • Zygote produces spores by meiosis
  • Haploid gametophyte grows from spore by mitosis
  • Gametophyte can produce gametes or zoospores
  • Motile spores (zoospores) formed by mitosis or meiosis

Sporangium: cell that produces spores by mitosis

Spore: haploid cell that can grow by mitosis

Gametophyte: multicellular haploid structure that produces gametes

haplontic life cycle of ulothrix4
Haplontic Life Cycle of Ulothrix

To observe: Place a drop from the cell culture between a slide and cover slip.Include some green fibers in your sample.

You do not need to distinguish between gametangia and sporangia.

diplohaplontic life cycle of ulva
Diplohaplontic Life Cycle of Ulva
  • Photosynthetic Protist
  • Introduction of Mitosis in Diploid phase
  • Gametophyte produces isogametes
  • Isomorphic gametophyte and sporophyte

Sporophyte: multicellular diploid structure that produces spores by meiosis

diplohaplontic life cycle of ulva6
Diplohaplontic Life Cycle of Ulva

To observe: Use a scalpel and/or forceps to take a small sample of the leafy structure and place it between a slide and cover slip.

You do not need to distinguish between sporophytes and gametophytes.

diplontic life cycle of fern
Archegonium: organ that produces eggs by mitosisDiplontic Life Cycle of Fern
  • Plant
  • Smaller gametophyte
  • Larger, longer-lived sporophyte with tissues and organs
  • Spores producedby meiosis in sporangia on the underside of sporophyte leaves

Antheridium: organ that produces sperm by mitosis

contain sporangia(singular: sorus)

prepared slide mature antheridia
Prepared Slide: Mature Antheridia

Sperm within Antheridia

Gametophyte with Antheridia

prepared slide mature archegonia
Prepared Slide: Mature Archegonia

Each archegoniumcontains one egg

Gametophyte with Archegonia

observation sorus sprorangia and spores



Observation: Sorus, Sprorangia and Spores

To observe: Scrape some material from the underside of a fern leaf onto a slide. Distribute it into a thin layer. Add a cover slip. Adding water is optional.